Offal Bag

A giant Hissing Cockroach is called out of big burlap sack filled with fresh dung. 

Book of Vile Darkness 3.5
By Monte Cook

The Giant Hissing Cockroach remains for 1 hour or until killed. It obeys all verbal commands of the bag owner, although it will not roam farther than 100 feet from the bag. If it is forcibly moved farther, it responds to no commands, although it will still disappear after its hour is up. Unlike other vermin, a Giant Hissing Cockroach brought forth from this bag understands Common and has an Intelligence score of 3.

Caster Level: 3rd; Prerequisites: Craft Wondrous Item, summon monster II; Market Price: 3,000 gp. Weight: 10 lb.